Brokebastard

I just did a full tune up on the runner and working out the kinks of the proplems people made before me. Like half ass deleting the the egr leaving much of the vacuum to the sensors undone. And blocking of the the fuel return. So I got most of that fixed replaced knock sensor. Got it running. Running better now but not great still a few more little things to deal with. Also it is still throwing knock sensor code and code 14. Swapped the coil out of my other runner same thing so I swapped them back. Then yesterday started missing and sputtering while driving and losing power. Turned it off let it sit then drove to my dad's turned it off and now won't start. Fuel pressure is good pulled plug wire no spark pulled coil wire one faint spark every once and awhile. So I swapped could again same crappy spark. Is it the ecm? This just has me stumped. How can I test if it is the ecm?